Move sphinx docs to seperate file

docs/using/index.md

@@ -5,6 +5,7 @@ MyST documents.
 
 ```{toctree}
 install.md
+sphinx.md
 syntax.md
 use_api.md
 ```

docs/using/install.md

@@ -22,9 +22,3 @@ pip install -e .[sphinx,code_style,testing,rtd]
 
 This should install the myst fork of mistletoe, along with the Sphinx parser
 that is included in the "extensions" configuration of this site.
-
-## Using Myst Parser with Sphinx
-
-Sphinx is a documentation generator for building a website or book from multiple source documents and assets. To get started with Sphinx, see their [Quickstart Guide](https://www.sphinx-doc.org/en/master/usage/quickstart.html).
-
-To use the MyST parser in Sphinx, simply add: `extensions = ["myst_parser"]` to your `conf.py`.

docs/using/sphinx.md

@@ -0,0 +1,7 @@
+# Using with the Sphinx Document Generator
+
+Sphinx is a documentation generator for building a website or book from multiple source documents and assets. To get started with Sphinx, see their [Quickstart Guide](https://www.sphinx-doc.org/en/master/usage/quickstart.html).
+
+To use the MyST parser in Sphinx, simply add: `extensions = ["myst_parser"]` to your `conf.py` and all documents with the `.md` extension will be parsed as MyST.
+
+Naturally this site is generated with Sphinx and MyST!